Centering mechanism for type-machines.



J. S. BANGROFT & M. C. INDAHL.

GBNTBRING MBGHANISM POR TYPE MACHINES.

APPLICATION FILED JULY 15, 1912.

1,094,624. Patented Apr. 28, 1914.

6 SHEETS-SHEET 1.

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J. S. BANOROFT & M. C. INDAHL,

CENTBRING MEGHANISM FOR TYPE MACHINES.

APPLIOATION FILED JULY 15, 1912.

1,094,624, Patented Apr. 28,1914.

6 SHEETS-SHEET 2.

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J. S. BANCROPT & M. C. INDAHL.

GBNTBRING MBGHAMSM PoR TYPE MACHINES.

APPLIOIATION FILED JULY 15, 1912.

1 ,094,624. Patented Apr. 28, 1914.

6 SHEETS-SHEET 3. v

J. S. BANGROPT & M. C. INDAHL.

GENTERING MEGHANISM PoR TYPE MACHINES.

APPLICATION PILBD JULY 15,1912.

1 ,094,624, Patented Apr. 28, 1914.

6 SHEETS-SHBET 4.

CBLUMBIA PLANOolAPM co..wASHxN1'0N. D. c.

J. S. BANCROFT & M. C. INDAHL.

GBNTBRING MBGHANISM FOR TYPE MACHINES.

APPLICATION FILED JULY 15,1912.

1,094,624. Patented Apr. 28, 1914.

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J. s. BANGROPT L M. C. INDAHL.

GENTERING MEGHANISM FOR TYPE MACHINES.

APPLIATION FILED JULY 15,1912.

1,094,624, Patented A111228, 1914.

6 SHEETS-SHEET 6.

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JOHN SELLERS BANCROFT AND MAURITZ C. INDAI-L, OF PHILADELPI-Ii, PENNSYL- VANIA, ASSIGNORS TO LANSTON MUNOTYPE BTACHINE COMNY, OF PHILADEL- PHIA, PENNSYLVANIA, A CORPGRATION 0F VIRGINIA.

CENTERING MECHANISM FOR TYPE-MACHINES.

incassa.

To ZZ 107mm it may concern.'

Be it known that we, Jol-1N SELLERS BAN- onorr and Macaira C. INDAHL, citizens of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certa-in new and useful improvements in Gentering Mechanism for lype-liiachines; and we do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying' drawings, forming part of this specification, and to the figures and letters of reference marked thereon.

The present invention relates to a new and improved centering or adjusting mechanism for type casting machines of the class illustrated in Patent No. 625,998, dated May 30, 1899, a distinguishing feature whereof is the direct movement of the performing members, such as the die case and mold adjusting devices, from one indicated position of adjustment to the next.

ln the machine referred to duplex adjusting means are employed for determining and effecting movements of adjustment in a given direction, each of the same including a primary controller or lined gage directly responsive to the signals of a record strip (represented by a plurality of separately movable stop pins serially arranged) g a primary positioning or gaging mechanism responsive to said primary controller (represented by a pair of oppositely movable jaws whose closed position may be indicated by any pin of the primary controller) 3 asecondary controller or shiftable gage responsive to said primary positioning mechanism or jaws (represented by a movable stop-bar interposed between and brought to position by the closing of the primary jaws) and a secondary positioning` or gaging mechanism responsive to the secondaryT controller and acting upon the performing` members to position the latter (represented by a second pair of opposit-ely movable jaws closing' upon the stop bar and upon translating devices coupled with the die case or mold adjusting devices or both).

To effect rapid, positive and accurate movements of adjustment of the performing members, it is desirable that the jaws of the positioning mechanism acting thereon should Specification of Letters Patent.

Application filed July 15, 1912.

Patented Apr. 28, fillet..

Serial No. 709,468.

positively engage and-clamp between them both the controller and the translating devices coupled with said performing members, and were it not for its incapacity to deal with defective signals, the signal-responsive or primary controller of said patent might have been advantageously applied directly to said positioning mechanism. rlhe defective signals referred to are such as effect a simultaneous movement or projection of two or more pins of the signal responsive controller, and may be produced by striking at one time two or more keys of the keyboard on which the record strip is produced, or by a vagrant perforation or perforations in the record strip occurring in operative relation to an otherwise correct signal. When such a defective signal is presented to the machine, two or more pins of the controller will beisimultaneously projected, and if the jaws were arranged to close upon opposite sides of individual pins, to define the successive closed positions indicated by the serial arrangement of the latter, no closure could take place as each jaw would be arrested by the nearest pin, with the result that the jaws would remain open or distended to a greater or lesser extent, leaving the dependent member, or that which they are intended to position, at large and free to assume any position intermediate the jaws. lt was this inability on the part of the signal-responsive controller to effectively deal with the situation thus presented that led to the adoption of two controllers and positioning mechanisms, wherein the positively acting positioning mechanism is employed in conjunction with the performing members, and a yielding positioning mechanism in connection with the signal-responsive controller, said last named positioning mechanism being so constructed and arranged that only one of its jaws contracts with the pins of the controller, hence is arrested by the first of the series of pins in case two or more are projected at the same time. The other jaw is then advanced, through yielding connections, into cont-act with the pin-arrested jaw and the dependent member or stop bar interposed between the two jaws is thus brought into position for the action of the aws of the secondary positioning mechanism. The produced adjustnic-nt. allhongli erroneou'. is n normal one, in but it corresponds with the stage indi fief: hy tn@ pin nzirest the engaging inw,

c.: hence lhfc dpndien niclianisni is brought 5 inl@ mjc-.inthe pnsnzion und cordinzition ls. 20 drawings illustrat- @iiihodiinnt of sa id n mg plan view 0ll n 0i? n. r1-Jp@ casting machine Wih i@ impr-nre l ucntnring ninclinnisni applied i Fig. 2 n mp plan View 0i'z alle mechanism delnchdg is 0 mechanism;

i i Qrsvicziw of 5;, d nifeuhnnigni; iriinsrore .f'errical Sfection shim L. it nl? gages in normal poaition; i5 iS Siniilnr YinW Showing the Complel silt of gages; i" a top plzrn (if n modif-ind forni of the Entering "ing f1.4 8 is n ierspectlve Ol the 35 i mn in Fig. Y; Fig. 9 is and "i the ninrhnnisni Shown in Fig. l i cran Vertical section 0n lino. 1f; Fig. ll is a cliai.zi1n1nntic Connection; Fig. l2 is n. dizin View indicating SnCCeSSive por- "Y Lion indiczilo und the signals lhnrewith; Fig. l i3 i 50p n dill'lerent type of station in- .'hodying generic critures. Fig. elsmion of one sectinn und .i3 n Similar View of th@ other scction ".tion indiontor ol Fig. 13. 1G "rnnnnatic View Showing the "Wo @linnn overlapped in operative p0- `i i i although or@ general appli- .'rnml in connection with the i'. hinQI oli lncni No. 525.7998 F, wherein it is designed to girzit immisnre. the diel or g' nachnnisnn, this posit-loir d inld adjusting Wedges. for iai-@Sant jpiirpnslsi to ih@ infiiicifml Qlninnta of finch as the di@y CnS@ l7 "-Cnlljf inmnhl@ Support /ijy' nirveniont of adjuntn l, finir any mi@ nl ngh the mold nel'. )in or pliinger and lever G lirongggh which ih@ :11c-

receivs its linnl @nutrir g E.. l chnnpd upon ma@ and alone, und the other the li@y @use mirrif rh@ three waives, :illhnngh :i third indnponneht canin:- npplied to the wedges. ample, in lzii'rnt No. onihcr 20. 1904-.

rll n centering mechanisms linreoiiure @inn ploy/'ed ifnr the purpose emhfriod n, primair gagging! niinhr winni-ish' n plurality if top pins serially nrrnngijed, @zich pins. sur@ the trn'iinnl on@ being' @dal pel nrsinn in the recmd; n primingv pnsil'i ing` nieshfinisin; a scnndziri' her; and :i neciiindary pori; nnisni. All d isplzu'cd sur@ die pnrion lernt ignnl'ed the Secondary positionin nisin (Wliiffh now hecnnies the Shia ing nmchzixiism), the Sani@ Coni oppositely movable jaws l0 :id-.ii

ployed. the one conrnlling the. di@l in sonic ii.

ng inorhzini i" l` i )led tr upon :in interposed portion il nl? forming' nweinlier or 01': ghe sgrzinlslnii llnch Oli Q.

rivers connecl'ed iherewith. 2 "LG jaws iS Cminecd 'to (me 0i nm mina j iHv/nrs l2', Whose oppite ends :irQ Cmnnmfrd. by a linl-r lil. @ne of Suid vinvern is pivot: ijf

other isa Connectnd hy i link atm: 1G, the arrnngcineiil" l ir'hen Said iclintfir issI Shiite i' 0l" its nmwnmn; th? jaws will im www lated into an adjustment during the next succeeding cycle.

i-iccording to the present invention the closed positions of the jaws is determined by a single signal-responsive station designator acting directly upon the jaws, and in which nal-responsive members operate eunnilatively to shift or change the station designator by an amount equal to the sum of the assigned values of the individual inembers at the time acted upon by the sio'nals, o that in the event an incorrect signal is presented the peiftcrming member or members will be brought to an operative though erroneous position.

wo Jrorms or types of station designators competent for the purpose are illustrated herein, the same being especially contrived to meet the requirfunents of the prior patented machine in that they each afford sixteen stages olr adjustment, or one in excess of the number alled for; but each is susceptible ot enlargement or restriction by the addition or subtraction of similar elements.

lleiaerring iirst to the form otl embodiment illustrated in Figs. l to G, inclusive. Between extensions 2O of the positioning jaws is located a lined abutment or datum member 2l, and on cach side of the latter is ranged a series ot gages, the members 22, 23, 2l, or 22X, 23, 2l", 25X, whereof diiler in linear measurement or value in the proportion of one, two, four and eight units, respectively; that to say, gages 22, 22X are each one unit in value; gages 23, 2 two units;

ifi

gages 2s, 2lb, tour units, and 25, 25X, eig it units, respectively. Corresponding of the two series are controlled by the ame signal-responsive devices, and they are so arranged and connected that the withdrawal of the one at the time between the jaws will automatically edi-ect the insertion et its counterpart on the opposite side ot the abutment, thereby changing the position oit the station indicator or interponent as many units as are represented bv the shifted gages without, however, altering its dimensions, which latter remain the same and equals the interval between the proximate 'faces oit eX- tensions 20, when the jaws are closed upon the translating devices. rlhe normal or initial position of the station indicator or that assumed when the signal-responsive devices are not in action may be indicated by the inteiponent formed by the abutment and any four gages of different values, and in the example given, where the action ot the primary of the prior machine is followed, the normal position oit said interponent is at one end et' the series and is indicated by s 22, 29 25, disposed in tandem with i utment 2i so that when the signal-responsive deyices are not active one of the jaws iu closing will encounter and be positively arrested by the abutment and the other jaw will in like manner engage and be arrested by the gage 25 most remote from the abutment. This adjustment corresponds with that produced by the stationary pin of the primary gage in the prior machine, which pin is brought into action only in the absence ot a centering signal perforation. llo advance the position of the station indicator or interponent to correspond with any desired number of units up to lifteen it is only necessary to withdraw one or more ot the gages 22, 23, 2s, 25, trom one side and insert the corresponding gages 22, 23X, 2%, 25", of the companion series on the opposite side of the abutment 2l. Thus, as indicatesw in F ig. l2, a one unit displacement is etilected by the withdrawal of 22 and insertion ot' 22X; a two unit displacement by withdrawing 23 and inserting 23X; a three unit displacement by withdrawing 22 and 23 and inserting 23 and 2li; a seven unit displacement by withdrawing 24 and inserting 219; a live unit displacement by withdrawing 22 and 2% and insertinU 22X and 2li-X; a six unit displacement by withdrawing 23 and 2i and inserting 28 and 24A; a seven unit displacement by withdrawing 22, 28 and 2l and inserting 22X, 23X and 24X; an eight unit displacement by withdrawing 25 and inserting 25X, a nine unit displacement by withdrawing 22 and 25 and inserting 22X and 25X; a ten unit displacement by withdrawing 23 and 25 and inserting 23X and 25"; an el ven lunit displacement by withdrawing 22, 23

and 25, and inserting 22X, 23X, and 25X; a twelve unit displacement by withdrawing 2s and 25 and inserting 2-LX and 25X; a thirteen unit displacement by withdrawing 22, 2l and 25 and inserting 22X, 24X and 25X; a iourteen unit displacement by withdrawing 23, 24 and 25, and inserting 23X, 2Q 25X; and a. fifteen unit displacement by withdrawing' 22, 23, 2d and 25, and inserting 22X, 23X, 24X and 25X. lt will thus be seen that the actuation of any one more ot the signal responsive devices will ei'lgect movements ot' the gages whereby the space value represented by the actuated gage or gages is transferred from one side oit the datum line to the other thus maintaining the station indicator ot' uniform linear extent but at different locations in the line oit movement ot the awsa ln other words a movement affecting a shitting of any one or more ot the gages will result in loeL ting the closing position of the jaws at one of the established stations, the two sets ot gages operating, in etlect, as plus and minus elements oin4 the station indicator, inasmuch as the with drawal et' any gage of one set creates a deficiency on one side of the common datum line, which deficiency is supplied by a of the same value on the other side said datum line, with the result that the l ar dimensions of the station indicator remain ae held nmmaf at one en@ en? fhe 03TH@ den by :spine 95X and, when pleasure 1S ed to :uw @ne er mere @it 'the motors he lDe 0f meveadmi el' the other in in bem-1i lt one OI H e A K il 1m, 111e pm Cil scribed, but comprehends as well other and different forms and varieties of signal-responsive station indicating mechanism adapted for direct action in connection with the oppositely movable positioning jaws, and posse the capacity of registering and indicating the cumulative as well as the separate values of individual signals, and in Figs, 13 to le inclusive, is shown, by way of illustration, a different type of station indicator possessing these characteristics and which may readily be substituted for the variety hereinbefore described. ln this eX- ample the various stations are indicated and established by an interponent composed of two movable members each controlled by two signal-responsive devices adapted for separate or conjoint action for determining `he di'lei'ent positions of the performing member. @ne of said movable members or sections represented by a stepped series of gages l, the latter projecting between the positioning jaws, and mounted upon a plate 5) arranged to reciprocate transversely of Vthe path of the jaws in or on guides 52 secured to the main frame. The several gages 5l. are of equal linear dimensions and successive gages are displaced one from another in a uniform degree longitudinally of the path of the jaws. ln the present instance the steps in the series measure four units each. rlhe length of each step coincides with the interval between the engag- L' portions of the positioning jaws when clot-ed so that by shifting the gage plate to bring one or the other of the gages 5l into the path of the jaws the closing position of the latter will be varied to corre- Aspend with the location of the gage at the time in position. rllhus if the first of the series of gages 5l is interposed between the jaws the latter will close at the point deterthe position of said gage in the mined by line of movement of said jaws; if the second 5l is thus interposed, the jaws will close at a point four units distant from the first station; if the third gage is interposed the closing point of the jaws will be eight units distant from the rst station; and if tie last or fourth gage is interposed the station indicated will be twelve units removed from the first station. In effecting these adjustments the guide for the gage `late 50 constitutes, in edect, the datum line om which the several stages of adjustment as effected by the stepped gages are computed, the rst gage representing zero or first position in the series. rlhe positioning of the gage plate 50 to bring its several gages individually in register with the jaws is ede/cted and controlled through the agency of a fixed stop 53 two pistons 54, 55, a lever 56, and a link 57. rlhe fixed stop 1 .i serves to define one extreme position of nlate 50, for example that n which the iirSt of the series of stepped gages 5l lies between and in line with the positioning jaws. This may be regarded as the norma-l position and is maintained by gravity, spring pressure or other yielding means. Pistons 5-l-, 55, are connected, respectively, to opposite ends of lever 56, and at a point between said pistons one third distant from piston said lever is coupled through link 57 with the gage plate. The strokes of the two pistons are the same, and the arrangement is such that when piston 54: is advanced its full stroke plate 50 will be moved to withdraw the first and locate the second gage between the jaws; when piston 55 advances its full stroke the gage plate will be advanced to bring the third of the series of gages into action; and when both pistons are advanced, the gage plate will be shifted to bring the fourth of the series of gages into position to receive the jaws. rlhus through the medium of the stop and the two pistons 54C, 55, each of which latter responds to a separate signal perforation in the record strip, the gage plate 50 can be established in either of the four positions required to present one or the other of its gages 5l between the jaws, to determine the closed position of the latter at successive stations located four units apart. Situated likewise between the positioning jaws in juxtaposition to gage plate 50 and in parallel therewith is the other member of the interponentin the form of a second gage plate G0 equipped with a series of stepped gages 6l, all of the same linear dimensions as the gages 5l, but displaced successively one unit, that is one fourth the displacement of successive gages 5l. Gage plate GO is coupled with the performing member or translating devices by having the engaging portion il thereof inserted in a guide or slot 611- in said gage plate, and the latter is supported to reciprocate longitudinally of the path of the jaws in guides in a carrier 65. Carrier G5 is in turn mounted in guides G5X on the frame to reciprocate transversely of the aws in parallel with plate 50, whereby gage plate may be shifted to bring any one of its gages 6l between and in alinement with the jaws and at the same time is free to follow the movements of said jaws in either direction.

The adjustments of carrier and of the contained gage plate 60 are or may be performed in the same way as the adjustments of plate 50; that is to say, through the medium of link 66, lever 67, and pistons 68, 69, these parts being so proportioned and arranged that when no signal perforation is presented carrier 65 resting against stop 70 will maintain the rst of the series of gages 6l between the jaws; an advance movement of piston 68 will shift. carrier 65 to present the second gage; a corresponding movement Cr i nt the third gage; and ist lns will present the i 't gages (il.

described this station a capaiity tor designatin sixteen surressirc positions and is under h tour signal-responsn'e devices7 l ,iy pistons fill-V, (3S and G9. ,-e understood that the adjustments gre plates it)j till, are made while the laws are separated and that the gage plates are maintained in said adjusted position the r osing` nioreinent oit jaws and ter the per'lforinnng devices are enii i i during' until at L rtl er. that in the absence of a or perliorations in the record orina' with one or inore oli the pistons 55, G8, (if), the plates 50, G0, will he inalntained in position to present the first ol' each series ot' gages 5l, (il, between and in. alinenient with the jaws. lt the jaws are closed with the gages in this position they will he arrested liy gage il in a prede terniincd rion to the datuni line and at the saine inne 'in so clcsing` the jaws will lirinir el into register with said gage ,l thtrehy est ihlishing a definite relation between the portail-innig nieniher and said closed position ol' the jaws. The position thus estafihshed .is the first ol' the series iirein provided lor and corresponds with that et the tix'd pin ot the priinary gage in the prior patented machines, and is attained when the record stripl contains no signal perforation reg-istoringI Vith the signal responsii'e devices Ell. .35, (Sti, t'rl. The second stage in the oit positions tor the perltornu al. pertoration in the ecord strip j with pister G8 and operatinlg` to te, titl to present the second ot the pped ges (El between the jaws. is displaced one unit troni the o' the upon the lirst e ill hare the elliect ot displacing c t() and the eirniiected periornnng` ineinhri .ant troni the sation atfiwhen said tirst (il was employed. n: the third et the series oit .Y a signal perforati on `Aon G9 which etlects the -r i on ot the third gage and the connected perwi l he inoretl hy the jaws l el coincides ii posio'aoeo lirst gage 5l, or tro ered i the lirst station; and

[i the `eries oit positions is indi- 'i d by a signal perte 'ation `.irtn lineup/htliy the jaws lirst ot the series "Dritt .in the position /closing oit the jaws upon said second gage 5l in conjunction with the lirst gage (il will :anse a tour unit displacement et the perte 'ming nienilier or a shitt to the litth oft' the series ct stations. i signal perliration ren;- istering with piston 5ft in association with one registering` with piston G8 whereby the second gages oli both series (il are presented in conjunction will elitcct an addi-- tional displacement et one 'unit and locate the pcritorining` nieinlier in the sixth posititni. lt will he seen that each successive advance ot gage plate (il adds one unit and each successive adrance ot gage plate 50 adds tour units, consequently the seventh station is indicated liy peri'orations registoring;` with pistons 54, 69; the eighth hy perfor-ations registering1 with -l, Gta and of); the ninth hy a perforation registerine` with the tenth hy pertorations regi teringI with 55, GS; he eleventh hy perfor-ations registering` with 55, 69; the twelt'th hy jairtorations rep'- isteringg with GS, G9; the thirteenth hy pcrlorations registeringgl with 5ft, 55; the fourteenth hy pertorz'itions registerilit` with 5l. 55, (58; the litteenth hy perjtorations registering' with nel, 55, 69; and the si teenth hy perftorations registering` with GS, (39. lt evident, therefore, that any possible con'iliination egt perforations controlling` selecting pistons 5ft, Gti, (S9, will tiring the performing n'ieinlier to one or the other ot the sixteen established stations and in harinony with the associated performing' nienihers ot the inachine in the event the first fifteen are utilized whether said perioration or perterz'itions is or are intentionally or ac cidentally present in the positioning signal.

ln operation each sional is presented and pressoirA applied to the record strip while tue jaws are tally disteiuled7 .Jherenpon the gages corresponding; with or cmitrolled hy the perforation or perfor-ations are actuated to adjust the interponent to correspond therew'ith. lfressure is maintained on the selected gages during' the closing; oit the jaws. which latter are positively arrested in closed position at the designated station and. in consequence, the pertorinine` ineinH lier is brought positively to position and there held until engaged by other retaining' ineans. Pressure is then withdrawn 'troni the gages.) and the jaws are opened, thereby permitting or con'ipelling; the ii-turn ot the Igraines to their nornial or initial positions ready for the action the next positioniinr sie; al. lt is obvious the norinal position of Lacasse rest of the station indicator', that is to say, the position assumed by the interponent when the sional responsive devices are inactive. (there being' no signal perforation presented) may be located at any one of the series ot stations, and unitary stages of adj nstment be computed in either or both directions therefrom. rlhe illustrated arrangements have been adopted merely as a matter ot' adaptation, to ha 'monize with the general scheme oi'l the prior machine wherein the normal is located at one extreme of the series ot indicated stations.

Having thus described our invention, what we claim is:

l. j; positioning or centering' mechanism :tor the performing' n'iembers or a type casting' machine, including, in combination, oppositely movable positioning' jaws and a signil-responsive station indicator acting directly upon said j aws to selectively determine dil'lerent adjustments of the performing; member.

2. )L positioning' or centering' mechanism such descriljued, including', in combination, the 'following' elements, to wit; oppositely movable positioning` jaws, a translating' device for the performing' member, and a simial-responsive station indicator interposed beween a -d acted upon by said jaws to position the performing' member.

3. lpositioning' or centering; mechanism such as described, including', in combination, oppositely movable positioninp' jaws and a signal-responsive station indicator interposed between and acted upon by both jaws.

-'l. positioning' or centering` mechanism includ'ng, in combination, the following' elements, to wit; oppositely movable positioning jaws; translating devices :tor a performing' membe interposed between and en ,ranged by said jaws; and a direct acting;` signalresponsive station indicator also interposed between and by said jaws to determine various po, Aons of' adjustment of the performing' member.

5. fr positioning or centering' mechanism such as described, including', in combination, the following' elements, to wit; oppositelv movable positioning' jaws; a signalresponsive str-tion indicator' provided with a plurality of arrange-rl for interposition between said jaws, and a plurality et signal responsive eric-es controlling' said frag/'es to shitt the 'o `on without changing' he linear dimensions oit the interponent beween the jaws.

(3. fr positioring or centering' mechanism such as described, including', in combination, a pair ot oppositely movable positioning); jaws and a station indicator therefor comprising' an inte ity of arranged i'or interposition between said jaws,

and a plurality ot signal responsive actua-tino; devices tor said gages operating individually or collectively to eilect an interchange ci' whereby the position of the interponent is shifted without change in its linear dimensions.

.7. ln a positioning' or centering` mechanism such as described, provided with oppositely movable positioning' jaws and in combination therewith, a direct acting' signal responsive station indicator, the same including' an interponent located between the jaws and composed ot members of two series ot gag/es acting' in coi-ijnncticn to shiitt its position in the line ot travel of the jaws without varying' the linear dimension of said interponent, and a plurality of signal responsive actuating' devices representina` dii'l'erent values and operating' to shift 'the gages to correspond with the sum oi' the values ot the signal responsive nevices'at the time acting'.

S. A positioning' or centering` mechanism such as described, including, in combination, oppositely movable positioning jaws and a direct actino' station indicator for said nws provided with a plurality oiu signal. responsive controlling means representing di'lierent values and less in numbe than the stations indicatedthereby.

9. in a positioning' or centering mechanism such as described, provided with oppositely movable positioning' jaws and in combination therewith, a station indicator provided with a sectional interponent against which both jaws operate.

l0. ln a positioning or centering mechanism such as described, provided with oppositely movable positioning' jaws, and in combination therewith, a station indicator' provided with two series et gages associated together to form a sectional int'erponent for the jaws, and a plurality ot signal responsive devices operating singly or conjointly upon said series of gages, to adjust the interponent and thereby indicate that one of the series of stations corresponding with the sum of the values of the signalresponsive devices at the time in action.

ll. A positioning` or centering' mechanism such as described, pro'ided with oppositely movable positioning jaws, and in combination therewith, a station indicator provider with a sectional interponcnt composed of two series oii'gas'es and signal responsive means acting singly and in multiple to varv the relative positions of' two series or gages, to indicate different 'positions et adjustment.

19,. ln a positioning or centering mechanism, such as described, provided with oppositely movable positioning jaws, and in coinbination therewith, a signal responsive station indicator provided. with a sectional interponent composed ot members or two llt) Civ 

